AT89C5131A-RDTUM datasheet(61/188 Pages) ATMEL

61 / 188 page

4337K–USB–04/08

AT89C5130A/31A-M

Reset Value = 000X 0000b

Not bit addressable

The watchdog timer function is implemented in module 4 (See Figure 14-4).

The PCA interrupt system is shown in Figure 14-2.

Figure 14-2. PCA Interrupt System

PCA Modules: each one of the five compare/capture modules has six possible functions. It can

perform:

• 16-bit capture, positive-edge triggered

• 16-bit capture, negative-edge triggered

• 16-bit capture, both positive and negative-edge triggered

• 16-bit Software Timer

• 16-bit High-speed Output

• 8-bit Pulse Width Modulator

In addition, module 4 can be used as a Watchdog Timer.

Each module in the PCA has a special function register associated with it. These registers are:

CCAPM0 for module 0, CCAPM1 for module 1, etc. (see Table 14-3). The registers contain the

bits that control the mode that each module will operate in.

CCF1

PCA Module 1 Interrupt Flag

Must be cleared by software.

Set by hardware when a match or capture occurs.

CCF0

PCA Module 0 Interrupt Flag

Must be cleared by software.

Set by hardware when a match or capture occurs.

Bit

Number

Bit

Mnemonic

Description

CCON

0xD8

CCF4 CCF3 CCF2 CCF1 CCF0

Module 4

Module 3

Module 2

Module 1

Module 0

ECF

PCA Timer/Counter

ECCFn CCAPMn.0

CMOD.0

IE.6

IE.7

To Interrupt

priority decoder

AT89C5131A-RDTUM Datasheet(PDF) 61 Page - ATMEL Corporation

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